Back support for a vehicle seat



FIG. 1 is a perspective view of a back support for a vehicle seat;

FIG. 2 is a front view, thereof;

FIG. 3 is a back view, thereof;

FIG. 4 is a left side view, thereof;

FIG. 5 is a right side view, thereof;

FIG. 6 is a top view, thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines and areas within them adiacent to shaded areas and solid lines depict portions of the back support for a vehicle seat that form no part of the claimed design. 

CLAIM The ornamental design for a back support for a vehicle seat, as shown and described. 